Materials Literature
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The lattice model of a polymer molecule with excluded volume and nearest-neighbor forces arising from polymer-solvent interaction is investigated by exact numerical calculation for short chains of up to about ten links. Extrapolation to large values of n, the number of links, is shown to be justified and enables the m…
Abstract During the last thrity years, dielectric measurements have been employed extensively to provide a better understanding of the interactions between polymer and plasticizer in various thermoplastic formulations. Recently, a series of melamine resins, plasticized to the extent that shrinkage and internal stress…
Abstract Inconel 718 is an age-hardenable nickel-chromium alloy having exceptionally high tensile, yield, creep, and rupture strength at temperatures up to 1300 F. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and compressive strength as well as fatigue. It al…
Abstract The photochemical isomerization of cis as well as trans-stilbene in n-hexane was studied kinetically in the temperature range 10∼30°C using the mercury lines of 313 and 334 mμ. Quantum yields were found to be 0.04 for the cis→trans, and 0.27 for the trans→cis conversion. Conversion rates for both directions o…
Using a silver – silver chloride reference electrode, the electrode potentials of the system U, UCl 3 (KCl, NaCl) and the redox potentials of the system Pt, UCl 3 , UCl 4 (KCl, NaCl) were measured at various concentrations of the uranium chlorides and at temperatures between 650 and 850 °C.From the results, the electr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE HYDROGEN VIBRATIONS IN COBALT CARBONYL HYDRIDE. BONDING CONSIDERATIONS.1Walter F. Edgell and Robert SummittCite this: J. Am. Chem. Soc. 1961, 83, 7, 1772–1773Publication Date (Print):April 1, 1961Publication History Published online1 May 2002Published inissue 1 April 196…
Abstract The types of anode and cathode reactions commonly found in corrosion by aqueous media are described, and the combination of these reactions in corroding and in passivated systems is discussed. The principal ways in which corrosion rates are increased or decreased are classified and discussed, as follows: anod…
The thermoelectric parameters α, 1/ρ, and 1/(K−Ke) of oriented polycrystals increase as the freezing rate decreases and as the temperature gradient in the liquid at the interface increases. The effects are primarily attributed to the variation in the degree of microsegregation produced in the crystals as a function of…
The transmission and degree of polarization of a quarter-wave stack of non-absorbing films deposited on a transparent substrate is expressed in terms of two variables. One variable is a function only of the refractive indices of the layers, the incident medium, and substrate ; the other variable depends on the angle o…
By utilizing the first positive bands of nitrogen to monitor the decay of atomic nitrogen caused by diffusion to a catalytic surface, the diffusion coefficient of atomic nitrogen in molecular nitrogen has been investigated, leading to a probable value of 280/p cm2 sec—1. The catalytic efficiency γ of silver and copper…
The heat capacities of ZrH2 and ZrD2 were measured in an adiabatic type calorimeter from 5 to 350°K. X-ray analyses showed the hydrides consist of a single face-centered tetragonal phase. The data for both compounds below 11°K were found to fit the equation Cv=9.8×10—4T+464.6(T/θ)3 cal deg—1 mole—1, where θ=311.4, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterstitial Compounds of BoronV. I. MatkovichCite this: J. Am. Chem. Soc. 1961, 83, 8, 1804–1806Publication Date (Print):April 1, 1961Publication History Published online1 May 2002Published inissue 1 April 1961https://pubs.acs.org/doi/10.1021/ja01469a008https://doi.org/10.1…
A Patterson sunnnation with {IF(hkl)l-IF(~kZ)I} ~ coefficients gives peaks at the end of vectors relating the anomalous scatterers in the structure. Application to two mercury derivatives of horse haemoglobin, using Cu Ka diffraction data, shows that the ends of vectors between mercury atoms can be recognized easily,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMeasurements of Transverse Dispersion in Granular Media.F. GraneCite this: J. Chem. Eng. Data 1961, 6, 2, 283–287Publication Date (Print):April 1, 1961Publication History Published online1 May 2002Published inissue 1 April 1961https://pubs.acs.org/doi/10.1021/je60010a031http…
The four-electrode method as used by Burger and van Milaan has several advantages over the Schwan method. It can be applied on human extremities without any perforation of the skin, no complicated corrections have to be made, and polarization can be neglected, as was demonstrated experimentally. Anisotropy of tissue h…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic Investigations of Spin-free Cobaltous Complexes. VI.1 Complexes Containing Phosphines and the Position of Phosphines in the Spectrochemical SeriesF. A. Cotton, O. D. Faut, D. M. L. Goodgame, and R. H. HolmCite this: J. Am. Chem. Soc. 1961, 83, 8, 1780–1785Publicatio…
The principles of the conversion of heat energy directly into electrical energy by use of a ferroelectric material heat cycled in the neighborhood of its Curie point are described. A simplified expression for the energy conversion efficiency is derived, and reasonable values for appropriate parameters are used to obta…
Measurements of the packing of spherical particles poured into a cylindrical container show that the intensity of deposition, the height of drop and the elasticity of the particle material influence the packing equally. Minor departures from perfect sphericity tend to mask the influence of elasticity. Optimum packing…
Discrepant interpretations regarding the frequency of the C=S stretching mode are reviewed and assignments of frequencies for the vibrational modes of the xanthate group, [Formula: see text] are presented.A band at 1020–1070 cm −1 is assigned to the C=S stretching mode. Bands at 1200 cm −1 and 1110–1140 cm −1 are ascr…
Abstract A study of the thermal conductivity of some amorphous and partially crystalline polymers as a function of temperature (0–100°C.) is described. Experiments have been carried out, with the use of a thermal conductivity cell with cylindrical geometry, on polyethylene, polytetrafluoroethylene, polystyrene, polyhe…